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The chromosomes of the Avena species were studied and their karyotypes established. The karyotype of the diploid species (excluding A. longiglumis) is designated as A. Longiglumis has a different karyotype with at least three chromosomes that have major changes. This karyotype is a modified A, designated as A′. The designation of the tetraploid karyotype is AB, including the basic set of chromosomes A and a second completely different set B. In the hexaploid species the basic set A is present but the B set is not; therefore the proposed designation is ACD. These results indicate an alloploid origin for the polyploid species.

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